The New York Times:
Trump's trade war may have already begun
31 January 2017
“The idea of trade wars these days, what politicians have in mind is really a 19th-century or early 20th-century conception of trade,” said Gianmarco I.P. Ottaviano, a trade economist at the London School of Economics. “You don’t even know who you’re going to hurt with these kind of things. You’re probably going to destroy American jobs in the end.”